This affordable drive is the first out of the gates with 128-layer TLC.

The SK Hynix Gold P31 NVMe SSD moves the needle on the industry seismometer just enough to makes this review far easier to write. Two points alter the needle’s path: The P31 is not only the first drive to sport 128-layer TLC NAND, it’s also the first in my experience to feature eco-friendly packaging. Huzzah!

Design and specs

While the SK Hynix Gold P31 uses the same 2280 (22 mm wide, 80 mm long) form factor as most SSDs, the similarities stop there. Instead of the usual 96 layers of TLC NAND, the P31’s TLC NAND sports 128. How this translates to “4D,” as the company refers to it in the product brief, rather than 3D, I’m not sure.
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https://www.pcworld.com/article/3571463/sk-hynix-gold-p31-ssd-review-the-first-128-layer-nand-drive.html